Clamp.



a w l f... l Y 5h* 6 .lfm 4. m @n m ,f M w n f u 4. f w S m, u n. OnE PS mmm AAH- ULF RUN m.. m P m. M P .P .A Q I UNITED STATES PATENT OFFICE.

PETER BROADBOOKS,` 'OF BATAVIA, NEWA YORK.

CLAMP.

No. 833,670. Specification of Letters Patent. Patented Oct. 16,1906.`

Application filed September 27, 1904. Serial No. 226.141. I

[o al? whom it may concern: l jaw B rigidly in position; but by forcing the Be it known that I,-PETER BnoADBooKs, a jaw B slightly forward said jaw may be citizen of the United States, residing at Bamoved easily and quickly to any` position tavia, county of Genesee, and State of New along the bar A` 6o York, have invented a certain new and use- To prevent the jaw B from falling forward ful Improvement in Vises or.Clamps, of4 of its own accord to keep the studs C in which the following is aspecification. clutch with the bar automatically, I pro My invention relates to a new and useful vide a spring D the rearward end of which improvementinvises or clamps, and hasfor its is secured to the jaw B upon the under side object to provide a device of this description of the crotch between thel two prongs, and in which one of the jaws of the vise or clamp this spring D then extends forward and the may be slid to any positionalong the bar and lower end presses downward against the upthen will automatically lock itself in this poper surface of the bar A, so that the jaw B is sition, and the opposite jaw is pivoted to the always held in such a position th at the studs 7o bar and may be rocked slightly to clamp the C are gripping the bar A, and to move the article between the two jaws. jaw B said jaw must be tilted forward against With these ends in view this inventionthe tension of the spring D. consists in the details of construction and E is the second jaw of the clamp or vise, combination of elements,hereinafter set forth which jaw is provided with a socket at its and then specifically desivnated by the claim. lower end, into which extends the forward In order that those skilled in the art to end of the bar A. Said jaw E is pivoted to which this invention appertains may underthe forward end of the bar A at the point F, stand how to make and use the same, the and there is sufficient room left Within the construction and operation will now be desocket of the jaw E to allow said jaw to be 8o scribed in detail, referring to the accompanytilted slightly forward upon the bar. ing drawings, forming a part of this specifica- G is an arm formed integral with the jaw tion, in which- E and extending rearward underneath the Figure 1 is a side elevation of my improved bar A. clamp or vise, a portion of the same being His acamjournaled in the rearward end of broken away to better illustrate its conthe arm G, and to this cam is connected a struction; Fig. 2, a section taken on the line lever I, by which the cam H may be revolved 2 2 of Fig. l Fig. 3, a side elevation of a porso as. to bring its cam-surface against the tion of the bar and a portion of the sliding under sideof the bar A, whichwill depress the jaw, showing a modified form of clutch. rearward end of the arm Gr and tilt the jaw E 9o The purpose of my invention is to transforward toward the jaw B, a spring I', intermit the power to the clamping-jaws from posed between the lower end of the bar A, the rear of said jaws througha lever made forward of the pivotal point F, and the lower integral with one of the jaws by means of a wall of the socket within the jaw E, tends to cani-lever or screw attached to the end of return the jawE to its normal position when said lever, so that the work may be clamped the cam II is rocked out of contact with the in place where there is not sufficient room bar A. Thus it will be seen that in using the for the hand to manipulate a lever or screw, vise or clamp the object to be clamped is as in ordinary clamps. brought into contact with the jaw E and A is a channel-bar. B is the sliding jaw, the j'aw B is slid -along the bar A until it is in Ioo the lower end of which is forked and stradcontact with the object to be clamped, and dies the bar A, and extending inward from then by simply pulling downward upon the the prongs of the jaw B are the studs C, one lever I'the jaw E may be rocked forward to set of studs bearing against the under surclamp the article as tightly as desired, and face of the top flange of the bar A, and the as soon as the camII is released the jaw E other set of studs, located rearward of the will be returned to its vertical or normal pofirst set, bears a ainst the top surface of thc sition by the spring I and the object can be lower flange of t e bar A. Thus if the jaw B easily released from the jaws. is pressed rearward the lower rearward studs In Fig. 3 I have shown a slightly-modified will bite into the lower flange of the bar and form of clutch in which one set of studs M iro the upper forward studs will bite into the bear against the upper surface of the lower upper flange of the bar A, and thus hold the flange of the bar A and a stud N extends across between the two prongs of the jaw B below the bar A and bears against the lower surface of said bar at a point forward of the studs M. Of course this accomplishes the same object in a slightly-different manner, and, in fact, there could be several variations made in the position of the studs without departing from the principle of the invention, and, if desired, the bar A need not have a channel upon each side, but could be made as an ordinary channel-bar having the channel all upon one side; but of course the double channelbar would be the most practical form to use.

Having thus fully described my invention, what I claim as new and useful is In a device of the character described, a bar having a recess, a jaw slidable on the bar, an L-shaped jaw provided with an openl affixed subscribing witnesses.

l ing mounted on and pivoted to the bar near the end having the recess, said pivoted jaw acting in conjunction with the sliding jaw, a spring within the recess of the bar bearing against one ofthe walls of the opening ofthe L-shaped jaw and holding a member of the L-shaped jaw normally parallel with the ar, means carried by the parallel member of the jaw engaging the bar to Inove said jaw on its pivot, the opposite walls of the opening in the L-shaped jaw being inclined to permit a movement of said j aw.

In testimony whereof I have hereunto my lsignature in the presence of two PETER BROADBOOKS. Witnesses:

C. B, PIXLEY, GEORGE A. KAPELL. 

